Incandescent electric lamp



(No Model.) E. E. CARY.

INGANDESGBNT BLEGTRIG LAMP. No. 501,491. Patented July 18,1893.

ll Alxl UNITED ,STATES PATENT OFFICE.

EDWARD EGBERT CARY, OF BOSTON, MASSACHUSETTS.

INCANDESCENT ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 501,491, dated J' uly 18, 1893.

Application filed April 6, 1893 Serial No. 469.289- (NO model-l To all whom it may concern:

Be it known that I, EDWARD EGBEET CARY, of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful Improvement in Incandescent Electric Lamps, of which the following, taken in connection with the accompanying drawings, is a specification.

My invention pertains to incandescent electric lamps of the kind in which the leadingin wires are inclosed and supported and the lamp globe made air tight by a fusible cemfent. It consists in. a device for preventing the leading-in wires from conveying by conduction, the high temperature of that part of the lamp near the incandescent filament to the cement.

In the accompanying drawingsz-Figure l, shows partly in vertical section and partly in side elevation an incandescent electric lamp embodying my invention. Fig. 2, is a plan of a detail. f

K is the globe of an incandescent electric lamp, L the filament attached at ZZ to the leading-in wires M M.

N is a disk of mica or other suitable substance resting upon the shoulder O formed in the neck of the lamp globe and which serves to partially support the leading-in Wires MM and the plug of cement P, by Which the lamp is rendered air tight.

R is a disk smaller but similar to the disk N and rests upon the shoulder S also formed in the neck of the lamp globe. The shoulder S is convenient and desirable but is not indispensable. l

T T vare two small cylinders of metal preferably of brass, into one side of which a iine saw-cut or slot has been made as far as the axial line, as shown in Fig. 2, and which are placed each on one of the leading-in wires M above the disk R. They are secured in position by being pressed with pliers until the saw cuts, into which the wires have been introduced, shut together and tightly gri-p the latter. These small bodies of metalT T, I call radiators and they serve the purpose of absorbing from the wires M M the heat which they conduct from the incandescent filament and the hotter parts of the lamp, and by presenting a large radiating surface disperse it and prevent its passage through the Wires M M into the cement plug Pabove the disk N.

By using more than one of the radiators upon each wire, the effectiveness of them as radiators is very much increased as each suctaching to the leading-in wires of an incandescent electric lamp in which a fusible cement is used in rendering the lamp globe air` tight, radiators adapted to prevent said wires from softening the said cement by conducting to it, heat from the filament and hotter parts of the lamp.

l claiml. In an incandescent electric lamp, the

combination of the glass lamp globe K, fusi.

ble cementplllg P,iilament L, and leading-in wires M M with the radiators T T attached to said` wires, substantially as and for the purpose set forth.

2. In an incandescent electric lamp in which a fusible cement is used to render the globe of the lamp air tight, radiators located within the lamp and attached to the leadingin Wires, adapted to prevent the said Wires from softening the said cementby conducting to it, heat from the filament and hotter parts, substantially as and for the purpose setkforth.

3. In an incandescent electric lamp, radiators attached to the leading-in wires said radiators having a slot, by means of which, they are secured to said Wires, substantially as and for the purpose set forth.

4. In an incandescent electric lamp, the combination of the glass globe K, filament L, disk N, cement plug P, and leading-in wires M M, with, the radiators T T, and disk R, substantially as and for the purpose set forth.

In testimony whereof I have` signed my name to this specification, in the presence of two subscribing witnesses, on this 4th day of April, A. D. 1893.

EDWARD EGBERT CARY.

Witnesses:

FRANK G. PARKER, FRANK G. HATTIE.

IOO 

